Crystal nVision Reference Recorder - Callendar-Van.dusen.equation

nVision Operation Manual • Page 23
Platinum RTD sensor element types have the following general feature set:
Element
Temperature
Range
nVision (TCR)
Temp. Coecient
of Resistance
Base
Resistance
TCR (Ω/Ω/ºC)
Sensitivity
(avg. Ω/ºC,
0 to 100 ºC)
Platinum
-200ºC to 850ºC
(-328ºF to 1562ºF)
Pt100 (385) Euro 100Ω at 0ºC 0.00385 0.385
Platinum
-259ºC to 1235ºC
(-434ºF to 2255ºF)
Pt100 (3926) US 100Ω at 0ºC 0.003926 0.3926
Platinum
-259ºC to 630ºC
(-434ºF to 1166ºF)
Pt100 (3911) 100Ω at 0ºC 0.003911 0.3911
nVision’s RTD100 temperature module is designed to be used with 100Ω
platinum RTDs that can be wired in 2, 3, or 4-wire methodology. Default nVision setting is 3-wire,
but this can be modied with CrystalControl to achieve the method that you prefer.
See Temperature Module (RTD100) Specications for further information.
Callendar-Van.Dusen.Equation
The relationship between temperature and resistance is given by the Callendar-Van Dusen
equation.
R
T
= R
0
[1 + AT + BT
2
+ CT
3
(T-100)] for (-200°C < T < 0°C)
R
T
= R
0
[1 + AT + BT
2
] for (0°C ≤ T ≤ °C of Upper Temperature Range listed below)
Where: R
T
= the resistance at temperature, T; R
0
= the resistance at 0°C; and the constants A, B,
and C dependent upon RTD selected (TCR).
nVision (TCR)
Temp. Coecient
of Resistance
TCR
(Ω/Ω/ºC)
Temperature
Range
A
(°C
-1
)
B
(°C
-2
)
C
(°C
-4
)
Pt100 (385) Euro 0.00385
-200ºC to 850ºC
(-328ºF to 1562ºF)
3.9083 x 10
-3
-5.7750 x 10
-7
-4.183 x 10
-12
Pt100 (3926) US 0.003926
-259ºC to 1235ºC
(-434ºF to 2255ºF)
3.9848 x 10
-3
-5.87 x 10
-7
-4.0 x 10
-12
Pt100 (3911) 0.003911
-259ºC to 630ºC
(-434ºF to 1166ºF)
3.9692 x 10
-3
-5.8495 x 10
-7
-4.2325 x 10
-12